MGWR Class B

The Midland Great Western Railway B Class was a class of four 0-6-0 locomotives built by the North British Locomotive Company in 1904. It was an attempt at a more powerful 0-6-0 than the railway's existing Class L, and it shared some components with the Class A 4-4-0, like which it was weight restricted to the Dublin to Galway route. The locomotives were rebuilt with superheating in 1916 and 1917. In 1925 they were allocated to the Great Southern Railways as Class 646, also known as Inchicore Class J2, and when they were scrapped some of their tenders were given to Class A locomotives.